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|Section2= |Section3= |Section4= |Section7= |Section8= }} Aluminium sulfate is a chemical compound with the formula Al2(SO4)3. It is soluble in water and is mainly used as a flocculating agent in the purification of drinking water and waste water treatment plants, and also in paper manufacturing. Aluminium sulfate is sometimes referred to as a type of alum. Alums are double sulfate salts, with the formula , where A is a monovalent cation such as potassium or ammonium and M is a trivalent metal ion such as aluminium. The anhydrous form occurs naturally as a rare mineral millosevichite, found e.g. in volcanic environments and on burning coal-mining waste dumps. Aluminium sulfate is rarely, if ever, encountered as the anhydrous salt. It forms a number of different hydrates, of which the hexadecahydrate Al2(SO4)3•16H2O and octadecahydrate Al2(SO4)3•18H2O are the most common. The heptadecahydrate, whose formula can be written as ()2(SO4)3•5H2O, occurs naturally as the mineral alunogen. ==Preparation== Aluminium sulfate may be made by adding aluminium hydroxide, Al(OH)3, to sulfuric acid, H2SO4: :2 Al(OH)3 + 3 H2SO4 → Al2(SO4)3+6H2O or by heating aluminum metal in a sulfuric acid solution: : 2 Al(s) + 3 H2SO4 → Al2(SO4)3 + 3 H2 (g) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aluminium sulfate」の詳細全文を読む スポンサード リンク
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